| | Globular Cluster | M15 | Messier 15 | NGC 7078 | | M15, at Class IV, is one of the most densely-packed globular clusters, and one of the few known to contain a planetary nebula (Pease 1 or K 848, 15.5 mV and 3' diameter). With over 100,000 stars, this cluster is 175 light years in diameter. It is thought to contain a black hole at its core. Half the cluster's mass is concentrated within the central 1.06'. The brightest stars are 12.6 mV. | | |
| Details: | | Night of: | Saturday September 19, 2009 | Site: | Joshua Tree | Local Time: | 1:00 AM | Sep 20, 2009 | Altitude: | 50° | | RA: | 21h 29m 58s | Declination: | +12d 10' | | Distance: | 33,600 light years | Magnitude: | +6.2 mV | Size: | 18' |
| | Camera Settings: | | Telescope: | 9.25-SCT | Camera: | Orion Starshoot DSI2 + f/3.3 Reducer | f/ratio: | f/3.3 | Pixel Scale: | 2.08 arcsec | Image Size: | 771 x 571 pixels (0.4 MP) | | 26.7' x 19.8' | Exposure: | 15 sec | |
Stacked Frames: | 11 | Total Integration: | 3 minutes |
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